PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:C1A4B

DTC Code DTC Name
C1A4B Stop Light Relay Circuit

DESCRIPTION

The skid control ECU (brake booster with master cylinder assembly) sends a stop light operation request signal to the stop light relay (stop light switch assembly). If the skid control ECU (brake booster with master cylinder assembly) detects a malfunction in the stop light relay (stop light switch assembly) circuit, the driving support ECU assembly stores DTC C1A4B.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A4B Stop Light Relay Circuit

Both of the following conditions are met:


  1. All of the following conditions are met:


    • 3 seconds have elapsed since the power switch was turned to on (IG).

    • The auxiliary battery voltage is 10 V or more for 3 seconds or more.

  2. All of the following conditions are met for 1 second or more:


    • Communication between the driving support ECU assembly and skid control ECU (brake booster with master cylinder assembly) is normal.

    • The driving support ECU assembly receives a stop light relay circuit malfunction signal from the skid control ECU (brake booster with master cylinder assembly)

Tech Tips

The skid control ECU (brake booster with master cylinder assembly) will detect a stop light relay circuit malfunction if any of the following conditions are met:


  • When the voltage at the IG1 terminal is between 11 V and 14 V and the stop light illumination output (STPO) signal is on, a signal has not been input to the STP terminal continuously for 2 seconds or more.

  • When the voltage at the IG1 terminal is between 11 V and 14 V and the stop light illumination output (STPO) signal is off, the input signals at the STP terminal and STP2 terminal differ continuously for 5 seconds or more.

  • Skid control ECU (Brake booster with master cylinder assembly)

  • Stop light relay (Stop light switch assembly)

  • Rear combination light socket and wire sub-assembly LH

  • Rear combination light socket and wire sub-assembly RH

  • Center stop light set

  • Hybrid vehicle control ECU

  • Certification ECU (Smart key ECU assembly)

  • Vehicle approaching speaker controller

  • Harness or connector

WIRING DIAGRAM

B005YOZE02

CAUTION / NOTICE / HINT

Note


  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • Make sure that there is no looseness at the locking part and the connecting part of the connector.

  • Check both the connector case and the terminals for deformation and corrosion.

PROCEDURE


  1. INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) CONNECTOR)


    1. Turn the power switch off.

    2. B005ZMLC10
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Disconnect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A58-6 (STP2) - Body ground Brake pedal depressed 11 to 14 V
      Brake pedal released Below 1.5 V
      A58-3 (STPO) - Body ground Always 11 to 14 V
      A58-33 (STP) - Body ground Brake pedal depressed 11 to 14 V
      Brake pedal released Below 1.5 V

    4. Connect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Result Proceed to
      The voltage is as specified for every terminal. A
      Only the voltage at terminal STP2 is not as specified. B
      Only the voltage at terminal STPO is not as specified. C
      Only the voltage at terminal STP is not as specified. D
      The voltage at both terminal STPO and terminal STP are not as specified. E

    B

    INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) CONNECTOR) Click here

    C

    CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY)) Click here

    D

    INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) CONNECTOR) Click here

    E

    CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY)) Click here

    A

  2. PERFORM ACTIVE TEST USING GTS (STOP LIGHT RELAY)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Chassis / ABS/VSC/TRC / Active Test.

    5. According to the display on the GTS, perform the Active Test Stop Light Relay.

      Click here

      Chassis > ABS/VSC/TRC > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Stop Light Relay Stop light relay (Stop light switch assembly) ON / OFF Stop lights come on
      OK
      The stop lights turn on and off correctly in response to the operation of the Active Test.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY) Click here

    OK

  3. CHECK FOR DTCS (PRE-CRASH SAFETY SYSTEM)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Pre-Crash 2 / Trouble Codes.

    5. Clear the DTCs.

      Click here

    6. Enter the following menus: Chassis / ABS/VSC/TRC / Active Test.

    7. According to the display on the GTS, perform the Active Test Stop Light Relay.

      Click here

      Chassis > ABS/VSC/TRC > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Stop Light Relay Stop light relay (Stop light switch assembly) ON / OFF Stop lights come on

    8. Enter the following menus: Body Electrical / Pre-Crash 2 / Trouble Codes.

    9. Check for DTCs.

      Click here

      OK
      DTC C1A4B is not output
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) for LHD: Click here for RHD: Click here

  4. INSPECT STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY)


    1. Inspect the stop light relay (stop light switch assembly).

      Click here

      OK
      The stop light relay (stop light switch assembly) is normal.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) for LHD: Click here for RHD: Click here

    NG

    REPLACE STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY) Click here

  5. INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) CONNECTOR)


    1. Turn the power switch off.

    2. B005ZMLC11
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Disconnect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A58-6 (STP2) - Body ground Brake pedal released Below 1.5 V

    4. Connect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY)) Click here

    OK

  6. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - HYBRID VEHICLE CONTROL ECU)


    1. Disconnect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

    2. Disconnect the A21 hybrid vehicle control ECU connector.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A58-6 (STP2) - Body ground Brake pedal depressed 11 to 14 V

    4. Connect the A21 hybrid vehicle control ECU connector.

    5. Connect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    NG

  7. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY))


    1. Turn the power switch off.

    2. Disconnect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

    3. Disconnect the A79 stop light relay (stop light switch assembly) connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A58-6 (STP2) - A79-3 (L) Always Below 1 Ω
      A58-6 (STP2) or A79-3 (L) - Body ground Always 10 kΩ or higher

    5. Connect the A79 stop light relay (stop light switch assembly) connector.

    6. Connect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY))


    1. Turn the power switch off.

    2. Disconnect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

    3. Disconnect the A79 stop light relay (stop light switch assembly) connector.

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A58-6 (STP2) or A79-3 (L) - Body ground Brake pedal released Below 1.5 V

    5. Connect the A79 stop light relay (stop light switch assembly) connector.

    6. Connect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY) Click here

    NG

  9. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - HYBRID VEHICLE CONTROL ECU)


    1. Disconnect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

    2. Disconnect the A21 hybrid vehicle control ECU connector.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A58-6 (STP2) - Body ground Brake pedal released Below 1.5 V

    4. Connect the A21 hybrid vehicle control ECU connector.

    5. Connect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY))


    1. Turn the power switch off.

    2. Disconnect the A79 stop light relay (stop light switch assembly) connector.

    3. Disconnect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A58-3 (STPO) - A79-4 (ACC) Always Below 1 Ω

    5. Connect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

    6. Connect the A79 stop light relay (stop light switch assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. INSPECT TERMINAL VOLTAGE (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) CONNECTOR)


    1. Turn the power switch off.

    2. B005ZMLC13
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      Disconnect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A58-33 (STP) - Body ground Brake pedal released Below 1.5 V

    4. Connect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY)) Click here

    OK

  12. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))


    1. Disconnect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

    2. Disconnect the L195 certification ECU (smart key ECU assembly) connector.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A58-33 (STP) - Body ground Brake pedal depressed 11 to 14 V

    4. Connect the L195 certification ECU (smart key ECU assembly) connector.

    5. Connect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

  13. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - VEHICLE APPROACHING SPEAKER CONTROLLER)


    1. Disconnect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

    2. Disconnect the L188 vehicle approaching speaker controller connector.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A58-33 (STP) - Body ground Brake pedal depressed 11 to 14 V

    4. Connect the L188 vehicle approaching speaker controller connector.

    5. Connect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE VEHICLE APPROACHING SPEAKER CONTROLLER Click here

    NG

  14. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - REAR COMBINATION LIGHT SOCKET AND WIRE SUB-ASSEMBLY LH)


    1. Disconnect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

    2. Disconnect the R17 rear combination light socket and wire sub-assembly LH connector.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A58-33 (STP) - Body ground Brake pedal depressed 11 to 14 V

    4. Connect the R17 rear combination light socket and wire sub-assembly LH connector.

    5. Connect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE SUB-ASSEMBLY LH Click here

    NG

  15. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - REAR COMBINATION LIGHT SOCKET AND WIRE SUB-ASSEMBLY RH)


    1. Disconnect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

    2. Disconnect the S18 rear combination light socket and wire sub-assembly RH connector.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A58-33 (STP) - Body ground Brake pedal depressed 11 to 14 V

    4. Connect the S18 rear combination light socket and wire sub-assembly RH connector.

    5. Connect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE SUB-ASSEMBLY RH Click here

    NG

  16. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - CENTER STOP LIGHT SET)


    1. Disconnect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

    2. Disconnect the V13 center stop light set connector.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A58-33 (STP) - Body ground Brake pedal depressed 11 to 14 V

    4. Connect the V13 center stop light set connector.

    5. Connect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CENTER STOP LIGHT SET Click here

    NG

  17. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY))


    1. Turn the power switch off.

    2. Disconnect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

    3. Disconnect the A79 stop light relay (stop light switch assembly) connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A79-3 (L) - A58-6 (STP2) Always Below 1 Ω
      A79-1 (OUT) - A58-33 (STP) Always Below 1 Ω
      A79-1 (OUT) or A58-33 (STP) - Body ground Always 10 kΩ or higher

    5. Connect the A79 stop light relay (stop light switch assembly) connector.

    6. Connect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  18. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY))


    1. Disconnect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

    2. Disconnect the A79 stop light relay (stop light switch assembly) connector.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A58-33 (STP) - Body ground Brake pedal released Below 1.5 V

    4. Connect the A79 stop light relay (stop light switch assembly) connector.

    5. Connect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY) Click here

    NG

  19. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))


    1. Disconnect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

    2. Disconnect the L195 certification ECU (smart key ECU assembly) connector.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A58-33 (STP) - Body ground Brake pedal released Below 1.5 V

    4. Connect the L195 certification ECU (smart key ECU assembly) connector.

    5. Connect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

  20. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - VEHICLE APPROACHING SPEAKER CONTROLLER)


    1. Disconnect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

    2. Disconnect the L188 vehicle approaching speaker controller connector.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A58-33 (STP) - Body ground Brake pedal released Below 1.5 V

    4. Connect the L188 vehicle approaching speaker controller connector.

    5. Connect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE VEHICLE APPROACHING SPEAKER CONTROLLER Click here

    NG

  21. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - REAR COMBINATION LIGHT SOCKET AND WIRE SUB-ASSEMBLY LH)


    1. Disconnect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

    2. Disconnect the R17 rear combination light socket and wire sub-assembly LH connector.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A58-33 (STP) - Body ground Brake pedal released Below 1.5 V

    4. Connect the R17 rear combination light socket and wire sub-assembly LH connector.

    5. Connect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE SUB-ASSEMBLY LH Click here

    NG

  22. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - REAR COMBINATION LIGHT SOCKET AND WIRE SUB-ASSEMBLY RH)


    1. Disconnect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

    2. Disconnect the S18 rear combination light socket and wire sub-assembly RH connector.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A58-33 (STP) - Body ground Brake pedal released Below 1.5 V

    4. Connect the S18 rear combination light socket and wire sub-assembly RH connector.

    5. Connect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE SUB-ASSEMBLY RH Click here

    NG

  23. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - CENTER STOP LIGHT SET)


    1. Disconnect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

    2. Disconnect the V13 center stop light set connector.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A58-33 (STP) - Body ground Brake pedal released Below 1.5 V

    4. Connect the V13 center stop light set connector.

    5. Connect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CENTER STOP LIGHT SET Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  24. CHECK WIRE HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) - STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY))


    1. Turn the power switch off.

    2. Disconnect the A79 stop light relay (stop light switch assembly) connector.

    3. Disconnect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A58-3 (STPO) or A79-4 (ACC) - Body ground Always 10 kΩ or higher

    5. Connect the A58 skid control ECU (brake booster with master cylinder assembly) connector.

    6. Connect the A79 stop light relay (stop light switch assembly) connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  25. INSPECT STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY)


    1. Inspect the stop light relay (stop light switch assembly).

      Click here

      OK
      The stop light relay (stop light switch assembly) is normal.
      Result
      Result Proceed to
      OK A
      NG (Stop light relay (Stop light switch assembly)) B
      NG (Power source circuit or Body ground circuit) C

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    B

    REPLACE STOP LIGHT RELAY (STOP LIGHT SWITCH ASSEMBLY) Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR